Characterisation and modelling of toughness in 7449-TAF aerospace aluminium alloy friction stir welds
- Derry C.G. and
- Robson J.D.
- Derry C.G. and
- Robson J.D.
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Description
Kahn notched tear tests and fractography were employed to investigate variations in toughness and fracture mode across the weld zones in friction stir welded AA 7449 plates (thickness 40 mm) in the TAF (temper for age-forming) condition. Welding was undertaken to half-penetration using a "Triflat" tool. Kahn tests were conducted with an Instron 5569 tensile testing machine and fractography was performed by field emission SEM in both secondary electron and backscattered electron modes. Vickers hardness values were determined. A model based on the inversely proportional relationship between hardness and toughness was proposed. Issues discussed include the dissolution, coarsening and transformation of precipitates caused by the heat input, transgranular failure in the HAZ and intergranular failure in the nugget.
7th International Symposium, 20-22 May 2008, 5A: Aerospace, Paper 02
Subjects
- Friction welding
- Welding
- Process
- Friction stir welding
- Aluminium and Al alloys
- Nonferrous
- Material
- 7xxx Al series
- Mechanical properties
- Properties
- Toughness
- Hardness
- Process conditions
- Computation
- Heat treatment
- Failure
- Weld zone
- Weld
- HAZ
- Dynamically recrystallised zone
- Defects
- Cracking
- Microstructure
- Grain
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